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 Costa Rica: Atylostagma politum

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Gerard Posted - 31/05/2016 : 14:46:31


Costa Rica, Santa Clara River, taille 29 mm

Bonjour, je n'ai aucune ide pour cette bte.
Merci de votre aide.
8   L A T E S T    R E P L I E S    (Newest First)
SDevesa Posted - 28/01/2021 : 17:40:43
Thanks Dan,
my first two specimens were collected by me in Nicaragua and the third in Quintana Roo.
So, I will name as politum.
dryobius Posted - 28/01/2021 : 14:30:29
The separation of the two species of Atylostagma is sometimes problematic.

My specimens of politum generally have a greater length/width ratio for the elytra and the pronotum tends to be somewhat less punctate and more smooth in the basal center region. A. glabrum seems to have less distinct elytral costae and is maybe a little bit paler in color, as well as being more uniformly punctate on the dorsum of the pronotum.

I would say that Sergio's three specimens are politum. Gerard's specimen "might" be glabrum or politum.

A. politum is very common in Mexico and occurs all the way down to Panama. Very common and widespread species can be expected to have differences. A. glabrum is not common, even in Arizona where it was described from.

The ranges of the "two" species overlap in Mexico and perhaps much farther south.

Spines on the antennal segments may be less than 100% reliable since populations of Atylostgma seem to be isolated by geography.

SDevesa Posted - 28/01/2021 : 11:20:09
Thanks Gerard,
So, your specimen is A. glabrum and not polita/politum.

I have 3 specimens in my collection. All have spines/thorns in both sides of the antennomeres.
So, all are A. glabrum. Do I'm right?

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Gerard Posted - 27/01/2021 : 21:03:44
Hello Sergio, you've seen it. There are thorns on either side.
SDevesa Posted - 27/01/2021 : 19:04:23
I'm a bit confused.

Answer in other specimen: Atylostagma glabrum (Atylostagma has gender neuter) has spines at both sides of the antennal joints, while politum has spines only at the inner side.

I see spines in both sides, so it should be A. glabrum. Do I am mistake?
Francesco Posted - 21/03/2019 : 18:22:05
Correctly, Atylostagma politum White 1853.
Gerard Posted - 31/05/2016 : 16:14:36
Merci beaucoup.
dryobius Posted - 31/05/2016 : 15:33:22
Atylostagma polita White 1853

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